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package com.oracle.truffle.api.test.polyglot;

import static com.oracle.truffle.api.test.polyglot.HostClassLoadingTest.TEST_REPLACE_CLASS_NAME;
import static com.oracle.truffle.api.test.polyglot.HostClassLoadingTest.createJar;
import static com.oracle.truffle.api.test.polyglot.HostClassLoadingTest.deleteDir;
import static com.oracle.truffle.api.test.polyglot.HostClassLoadingTest.renameHostClass;
import static org.junit.Assert.assertEquals;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.HostAccess;
import org.graalvm.polyglot.PolyglotException;
import org.graalvm.polyglot.Value;
import org.graalvm.polyglot.io.IOAccess;
import org.junit.Test;

import com.oracle.truffle.tck.tests.TruffleTestAssumptions;

public class SLHostClassLoadingTest {

    @Test
    public void testSLHostClassLoading() throws IOException {
        TruffleTestAssumptions.assumeNotAOT();
        HostAccess accessPolicy = HostAccess.newBuilder(HostAccess.ALL).build();
        try (Context context = Context.newBuilder().allowIO(IOAccess.ALL).allowHostAccess(accessPolicy).allowHostClassLookup(cls -> true).allowHostClassLoading(true).build()) {
            final Class<?> hostClass = HostClassLoadingTestClass1.class;
            Path tempDir = renameHostClass(hostClass, TEST_REPLACE_CLASS_NAME);
            Path jar = createJar(tempDir);
            assertHostClassPath(context, hostClass, jar);
            Files.deleteIfExists(jar);
            deleteDir(tempDir);
        }
    }

    private static void assertHostClassPath(Context context, final Class<?> hostClass, Path jar) {
        String newClassName = hostClass.getPackage().getName() + "." + TEST_REPLACE_CLASS_NAME;

        AbstractPolyglotTest.assertFails(() -> context.eval("sl", "function main() { return java(\"" + newClassName + "\"); }"), PolyglotException.class, (e) -> {
            assertEquals(e.getMessage(), "Access to host class " + newClassName + " is not allowed or does not exist.");
        });

        context.eval("sl", "function main() { return addToHostClassPath(\"" + jar.toString() + "\"); }");

        Value javaType = context.eval("sl", "function main() { return java(\"" + newClassName + "\"); }");
        assertEquals(42, javaType.getMember("staticField").asInt());
        Value javaTypeInstance = javaType.getMember("getInstance").execute();
        assertEquals(42, javaTypeInstance.getMember("testField").asInt());
        assertEquals(42, javaTypeInstance.getMember("testMethod").execute().asInt());
        javaType.putMember("staticField", 43);
        assertEquals(43, javaType.getMember("staticField").asInt());
        javaTypeInstance.putMember("testField", 43);
        assertEquals(43, javaTypeInstance.getMember("testField").asInt());
    }

}
